Cool, it got much harder now. I'm presuming the sudden wave of enemies around the 1300 kill mark is normal and is supposed to be a game-ender, considering that i don't think it's physically beatable with how much health the enemies suddenly got.
As a side note, the best strat imo is getting ice spikes to max (As usual), getting critical rate to 100% then pushing everything into ice damage and critical damage, considering that lightning is unreliable at best and fireball can only aim at one direction at a time. Got to like 1600 kills and killed the first wave i thought was unbeatable until the goons with the next buff to health came through that